Description
Round-bottom flask 250 ml with three necks is a laboratory vessel for distillation, synthesis and multi-component reaction work. The centre neck carries a standard ground joint NS 29/32, while the two side necks are set at 20° and finished with NS 19/26 joints, so condensers, dropping funnels, gas inlets or temperature probes can be fitted without crowding the setup. Made from clear borosilicate glass 3.3 by Witeg, the flask offers strong chemical resistance and thermal stability for routine heating and cooling. Nominal volume is 250 ml (0,25 l) with a net weight of 0,152 kg, matching common heating mantles, oil baths and stands. The three-neck layout supports reflux, simultaneous reagent addition and inert-atmosphere work in organic synthesis, pharmaceutical research and analytical sample preparation. Clear walls give an unobstructed view of mixtures, colour changes and phase boundaries. Suitable as a round-bottom, ground-joint, distillation or receiving flask, it serves research, quality-control and teaching laboratories that require reliable multi-neck glassware for wet-chemistry workflows.
This article is part of Round-bottom flasks, in Beakers & flasks. See also Flat-bottom flasks.
Key features
- Pack size: 1 pc(s)
- Nominal volume: 0,25 l
- Number of necks: 3
- Centre neck: NS 29/32
- Side necks: NS 19/26 angled 20°
- Material: Borosilicate glass 3.3
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Round bottom flask 250 ml three necks CN ST 29/32
What is this article?
Round bottom flask 250 ml three necks CN ST 29/32 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Round-bottom flasks, inside Beakers & flasks, in Labware.
A round-bottom flask is the heating flask of a distillation or a reflux. The curved wall takes the heat, and the ground neck connects to a still head or a condenser. The joint size, not only the volume, has to match the rest of the set.
A beaker is an open working vessel: easy to pour, poor as a measure. An Erlenmeyer flask has a flat base and a conical wall so a liquid can be swirled without climbing out. A round-bottom flask is for heating under a condenser, because the heat meets a curved wall and the joint at the neck connects to the rest of the glassware. Borosilicate is the glass that survives the temperature change. These forms are listed under ISO laboratory glassware.
Which category should I open next?
The category is Beakers & flasks. The sub-category is Round-bottom flasks. The catalogue is Labware.
Shelves beside this one are Beakers, Erlenmeyer flasks, Reaction vessels & jacketed vessels, Flat-bottom flasks, Flasks (other) and Beaker & flask accessories.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.